: a vacuum tube with a cathode, an anode, a control grid, and an additional grid or other electrode
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Depending on how many grids the tube has, it is called a diode (no grids), a triode (one grid), a tetrode (two grids), and so on.
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IEEE Spectrum, 29 Oct. 2020
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IEEE Spectrum, 29 Oct. 2020
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“Tetrode.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/tetrode. Accessed 1 Apr. 2026.
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